As the seekers wear completely white clothing throughout the film, including in the desert sequences, it was a tedious process for the costume designers and makeup artists to constantly clean the clothes whenever they became dirty, which was often.
Although at first reported as such, this was actually not the last movie Roger Ebert reviewed before his death. As reported by Jim Emerson, the last review Ebert wrote was for Terrence Malick's film To the Wonder (2012). However, the review for The Host (2013) was the last review that was published before his death.
Shiloh Fernandez had originally auditioned for Jared before Max Irons was cast. Ironically enough, both had previously collaborated in the film Red Riding Hood (2011), which was directed by Catherine Hardwicke, who also helmed Twilight (2008), a film based on another Stephanie Meyer novel. Shiloh Fernandez had also auditioned for Edward Cullen in that film before Robert Pattinson was cast.
The trivia items below may give away important plot points.
When Melanie jumps through the window to escape the seekers at the beginning of the movie, she is seen falling several stories and creating a crater in the cement pavement. At the very beginning of the end credits, the camera pulls away from a planet and it is the exact crater shape as the one Melanie made when she fell.